3-Methoxy-2-methylquinoline → 5,6,7,8-Tetrahydro-3-methoxy-2-methylquinoline

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Reaction Steps

A mixture of 3-methoxy-2-methylquinoline (0.081 mol) in trifluoro-acetic acid (150 ml) was hydrogenated at room temperature under a 3-4 bar pressure for 48 hours with palladium on activated carbon (2 g) as a catalyst. After uptake of hydrogen (2 equiv.), the catalyst was filtered through celite and washed with H2O. The filtrate was basified with a concentrated NH4OH solution and extracted with CH2Cl2. The organic layer was separated, dried (MgSO4), filtered and the solvent was evaporated, yielding 14.3 g (quant.) of 5,6,7,8-tetrahydro-3-methoxy-2-methylquinoline (interm. 13).

Provenance & Evidence